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2. Biological rhythms considered as relaxation oscillations;Pol;J Intern Med,1940
3. Regularities in growth curves, including rhythms and allometry;Sholl;Dyn Growth Process,1954
4. A mathematical model for the temperature effects on circadian rhythms;Pavlidis;J Theor Biol,1968
5. Theoretical analysis of some biological models;Klotter,1960